Google WebsiteOptimizer

www.Google.com/WebsiteOptimizerGoogle WebsiteOptimizer - has anyone used it? Is it any good for anything?

A/B Experiment - The simplest way to start testing fast

Multivariate Experiment - The most robust way to test lots of ideas

that allows you to run experiments to find what on-page changes will produce the best conversion rates with visitors. This, in combination with Google Analytics and Google Webmaster Tools (see our video on using the "Google Trifecta"), is a powerful way to begin improving your site.